Bioavailability as a tool in site management

Harmsen, J.; Naidu, Ravi

doi:10.1016/j.jhazmat.2012.12.044

Cited by 47 publications

(35 citation statements)

References 18 publications

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“…The latter is a kinetically driven process and usually governs the fate of the destabilized metals. If the detachment is not completed due to the insufficient contact time, it may lead to an increase of metal toxicity and bioavailability due to the formation of weakly-bound metal fractions [19, 20]. …”

Section: Introductionmentioning

confidence: 99%

Metal removal and associated binding fraction transformation in contaminated river sediment washed by different types of agents

et al. 2017

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In ex-situ washing, HCl, EDTA and H2O2 solutions can effectively extract heavy metals in river sediment. Nevertheless they often target different sediment components, possibly transforming metal species into more bioavailable and hence toxic ones. This study, in batch settings, investigated the influences of different types of washing agents (i.e. HCl, EDTA and H2O2) on metal (i.e. Cu and Zn) removal from contaminated river sediment, destroy or dissolution of sediment components, and transformation of metal fractions during chemical washing treatment. Additionally, bioavailability of these metals left in the washed sediment was assessed. Results showed that HCl obtained the highest Cu and Zn removal through destroying the reducible, oxidizable and residual sediment components. Meanwhile, it transformed metal fractions to acid extractable one, resulting in an increase in metal bioavailability. Thus, the feasibility of washing with HCl for sediment remediation shall be reconsidered due to the caused high metal bioavailability. EDTA was capable of removing metals via direct complexation of labile metal species and indirect dissolution of reducible and oxidizable sediment components, where the transformation of corresponding metal binding fraction may occur. H2O2 obtained the lowest total Cu and Zn removal, but it preferentially removed the oxidizable metal species by oxidizing sulfides in the sediment. The bioavailable levels of Cu and Zn in the sediment washed by EDTA or H2O2 seemed not increase. To maintain a good balance between labile metal species removal and avoiding increase of metal bioavailability, EDTA and H2O2 are promising additives for metal removal by sediment washing.

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Section: Introductionmentioning

confidence: 99%

Metal removal and associated binding fraction transformation in contaminated river sediment washed by different types of agents

et al. 2017

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“…So one possible way to manage contaminated sites would be to reduce the bioavailability of the contaminant to a point at which, despite the presence of residual pesticide, there is no bioavailable fraction (Harmsen and Naidu 2013). With the aim of limiting consumer and environmental exposure, we tested the incorporation of compost in soils as a possible way to reduce the contamination of water and crops.…”

Section: Introductionmentioning

confidence: 99%

Compost addition reduces porosity and chlordecone transfer in soil microstructure

Woignier

Clostre²,

Fernandes³

et al. 2015

Environ Sci Pollut Res

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Chlordecone, an organochlorine insecticide, pollutes soils and contaminates crops and water resources and is biomagnified by food chains. As chlordecone is partly trapped in the soil, one possible alternative to decontamination may be to increase its containment in the soil, thereby reducing its diffusion into the environment. Containing the pesticide in the soil could be achieved by adding compost because the pollutant has an affinity for organic matter. We hypothesized that adding compost would also change soil porosity, as well as transport and containment of the pesticide. We measured the pore features and studied the nanoscale structure to assess the effect of adding compost on soil microstructure. We simulated changes in the transport properties (hydraulic conductivity and diffusion) associated with changes in porosity. During compost incubation, the clay microstructure collapsed due to capillary stresses. Simulated data showed that the hydraulic conductivity and diffusion coefficient were reduced by 95 and 70% in the clay microstructure, respectively. Reduced transport properties affected pesticide mobility and thus helped reduce its transfer from the soil to water and to the crop. We propose that the containment effect is due not only to the high affinity of chlordecone for soil organic matter but also to a trapping mechanism in the soil porosity.

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“…It was deduced that the surfaces of low temperatures biochar can be hydrophobic, and could lessen its capacity to adsorb impurities. The nature, characteristics, quality, and potential use of biochar are affected by the form, type, preliminary steps of preparation and biomass feedstock size and type of pyrolysis product [43]. The initial ratio of exposure to total surface area of biochar could be affected by its size.…”

Section: Physico-chemical Characterisation Of Biocharmentioning

confidence: 99%

Review of Eco-Friendly Biochar Used in the Removal of Trace Metals on Aqueous Phases

Duwiejuah¹,

Cobbina²,

Bakobie³

2017

IJEBB

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Eco-friendly biochar produced from cost-effective and readily available agricultural waste will likely pose no threat on the aqueous phases, other environmental media, human health and emission of greenhouse gases to the atmosphere. Optimising biochar for an intended application could require careful selection of a biomass feedstock as well as production pyrolysis technique and conditions for the production of biochars with specific characteristics. Previous studies have explores the relationships that exist between biochar production conditions, characteristics, and possible end-uses of biochar. This review provides an overview of the production and utilisation of biochar as absorbents for adsorption of trace metals in contaminated aqueous environment. Biochar has great affinity to adsorb molecular ions that is making it possible to be used for various toxicological remediation strategies. It has proven effective and useful for mitigating aqueous metals, organic compounds, suspended solids, and organic hydrocarbons in a various kind of industrial applications such as urban and residential storm water runoff, landfill leachates, industrial runoff, resource extraction runoff, and industrial wastewater filtration. Specifically designed biochar could be very effective in the removal of trace metals from contaminated aqueous environment. The multiple factors that determine the adsorption of the trace metals in aqueous environment or phases needs to be carefully examined. Cost-effectiveness of biomass feedstock and eco-friendliness of techniques need to also be given much consideration by way of making comparison with existing contaminant mitigation technologies. Keywords: aqueous phases, biochar, cost-effective, biomass feedstock, removal, trace metalsCite This Article: A. B. Duwiejuah, S.

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Bioavailability as a tool in site management

Cited by 47 publications

References 18 publications

Metal removal and associated binding fraction transformation in contaminated river sediment washed by different types of agents

Metal removal and associated binding fraction transformation in contaminated river sediment washed by different types of agents

Compost addition reduces porosity and chlordecone transfer in soil microstructure

Review of Eco-Friendly Biochar Used in the Removal of Trace Metals on Aqueous Phases

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